Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 206 for “"hydrate"”.
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Characterization of calcium-silicate-hydrate and calcium-alumino-silicate-hydrate
… this thesis were to synthesize calcium silicate hydrate (C-S-H) and calcium aluminosilicate hydrate (C-A-S-H) and characterize their structures with varying Ca/Si ratios and aluminum content. As a secondary objective, carbonation behavior in synthesized C-S-H was studied. C-S-H was synthesized in …
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Hydrate-phobic surfaces
Clathrate hydrate formation and subsequent plugging of deep-sea oil and gas pipelines represent a significant bottleneck for ultra deep-sea production. Current methods for hydrate mitigation focus on injecting thermodynamic or kinetic inhibitors into the flow, heating the pipe walls, or managing …
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Sensitivity of tetrahydrofuran hydrate and methane hydrate equilibria to porous media
Includes bibliographical references (pages 98-103).
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Methane hydrate growth kinetics
Includes bibliographical references (pages 114-118).
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Impact of Hydrate Dissociation on the Stiffness and Strength of Hydrate Bearing Sands
… energy resources, notably natural gas hydrates. These ice-like compounds, abundant in permafrost and marine sediments, harbor vast quantities of methane, a potent energy source. However, conventional methods for recovering methane gas from natural hydrate bearing sand (HBS) deposits …
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Phase equilibrium study of methane hydrate
Gas hydrates are solid metastable ice like compounds formed when gas comes in contact with water and have the ability to form at low temperatures. In this study, methane gas hydrates were formed in a Berea sandstone core, which was saturated with brine and then pressurized with methane gas. The …
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Hydrate Formation Using Dowfax Gemini Surfactants
"Gas hydrate formation is a stochastic and slow process. However, the use of a small amount of surfactant can speed up the rate of hydrate formation. This work investigates the effect of two Dow surfactants, Dowfax 2A1 and Dowfax C6L, on gas hydrate formation, first by determining the adsorption …
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Equilibrium Conditions of Hydrate-Forming Pickering Emulsions
A key factor in hydrate risk management for an oil-governing system is the stability of the emulsified water with gas hydrate formation. The kinetics of formation of cyclopentane hydrates is investigated in a water-in-oil emulsion using differential scanning calorimetry with the effect of …
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Weakening of ice by magnesium perchlorate hydrate
I show that perchlorate hydrates, which have been indirectly detected at high Martian circumpolar latitudes by the Phoenix Mars Lander, have a dramatic effect upon the rheological behavior of polycrystalline water ice under conditions applicable to the north polar layered deposits (NPLD). I …
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The comparison of experimental and theoretical hydrate numbers
… for a more precise determination of the hydrate numbers of gas hydrates were developed. Hydrate numbers (the ratio of the moles of water to moles of gas in the gas hydrate) were determined for pure component ethane and methane hydrates at several equilibrium decomposition conditions and …
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Viscosity study of kinetics of hydrate formation, A
Includes bibliographical references.
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Methane storage and transport via structure H clathrate hydrate
… thesis examines the prospect of structure H (sH) hydrate to be exploited for methane storage. The methane content in the hydrate, hydrate kinetics and conversion rates are areas of particular importance. Experiments and theory are employed at the macroscopic and molecular levels to study the …
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Application of xenon hydrate to stabilize enzymatic proteins, The
Includes bibliographical references (pages 62-67).
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Hydrate formation and adhesion on low surface energy materials
Clathrate hydrates are ice-like solid substances that often form inside oil and gas pipelines and are responsible for flow blockages, sometimes leading to catastrophic disasters. Minimizing hydrate adhesion and accumulation of solids on pipelines can effectively address this problem. In this …
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Hierarchical modeling of structure and mechanics of cement hydrate
… building block of concrete, Calcium- Silicate-Hydrate (C-S-H). Given the variable stoichiometry and morphology of C-S-H, no accurate models were ever developed that could link electronic information at one end to the C-S-H molecular properties at the other end. This thesis develops a new …
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